1188
89.2
Model
No Page
AIR CONDITIONING, FIT TING INSTRUCTION
(PT94--- cabin) 30.07.1999
18(28)
28.06.1999
6000---8750
6250Hi---8950Hi
FAULT ANALYSIS AND SYMPTOMS
a) Leaks in the system w ill lead to inadequate cool -
ing and low and high gauge readings w ill be t oo
low.
b) If the system is under---charged, bubbles will be
permanently visible in the dehydrator sight glass
and both gauge readings will be low.
c) If the evaporator is dirty or an expansion valve is
blocked or frozen up, there will be a partial vac-
uum on the low pressure side and insufficient
pressure on the high pressure side.
d) An over---charged system, an expansion valve
stuck open or a clogged condenser will cause
excessive pressure on the low pressure side.
e) A clogged condenser and an over---charged
system will cause excessive pressure on the
high pressure side.
OVERCHARGE
Note! The correct refrigerant filling is about 1,4 kg
on 6000---8400 tractors.
--- In a correctly charged system, R12 discharged
from the compressor in the form of gas looses its
excess heat, resulting from compression in the
first coil of the condenser and condenses to a
liquid in the subsequent coils. Before flowing to
the reservoir, t his liquid is held in the last con-
denser coil. I f the system is over---charged, the
liquid level builds up in the condenser, leaving
fewer coils available to condense the gas. Both
temperature and pressure then build up, causing
hoses to burst in some cases.
To Next Page
Loading...
